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Slide 2

RESPONDING TO CHANGE Describe how a nervous response is brought about by stimuli, including the roles of receptors, sensory neurones, the coordinator and motor neurones. · Stimulus (Light bulb) -> Receptor (Eye) -> impulse travels along the sensory neurone to -> Coordinator (Brain) -> impulse travels along the motor neurone to -> Effecter (Eye muscle) -> Response · Neurone = A single nerve…read more

Slide 3

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RESPONDING TO CHANGE Describe a reflex action and the role of the relay neurone in this action. · Receptor (Finger) -> impulse travels along sensory neurone -> comes to synapse -> goes onto the relay neurone -> to synapse -> along the motor neurone -> Effecter (Arm muscle) · Synapse = gaps between the end of a neurone and the start of another or an effecter. · Axon = the end of a neurone.…read more

Slide 4

Slide 5

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RESPONDING TO CHANGE Explain that four internal conditions controlled by the body include; water content, ion content, body temperature and blood sugar. Describe, in very broad outline, how they are controlled. · Ion content leaves body 1) in sweat 2) excess lost via kidneys in urine. · The water content of body leaves body 1) in breath 2) as sweat 3) excess is lost via kidneys in urine. · Temperature -> maintain temperature at which enzymes work best. · Blood sugar levels -> to provide the cells with a constant supply of energy.…read more